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The Bicycle 1948 - TriVelox advert

The Bicycle 1948 - TriVelox advert main image

I am confused by this advert. As I understand it the TriVelox C-1 was a conventional pull-chain derailleur that moved the chain sideways over a relatively conventional three speed freewheel. This is not the device shown in the picture.

The TriVelox A-1 was a radical design with a static derailleur-like chain tensioner and a three speed freewheel that was moved side ways by a cable pulling a toggle chain. This is what is shown in the picture.


The Bicycle 1948 - TriVelox advert main image
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